#include <stdio.h>
#define ABS(x)  ((x)<0)?(-x):(x)
#define MAX(a,b)  (a)<(b)?(b):(a)
#define M(a,b,c)  a*b+c
void main()
{
    int a=3;      
    int b=6;
    int c=MAX(a,b);
    printf("max=%d\n",c);
}
